Internal data structures

• Cmdtype mytype - unique code for this derived class.
• int textExists - whether or not the text equivalent of this command has been created yet. This only needs to be done at most once, and sometimes not at all (if commands are not being logged to a file or the screen, for example).
• int hasTextCmd - whether or not this command even HAS a text equivalent ... some commands do not, for example Event's.
• char cmdtextbuf[256] - character buffer to hold the text equivalent string. This can be at most 256 characters.
• ostrstream *cmdText - character stream used to format the text equivalent.